Building board material



FIG. 1 is a front, top, right side perspective view of a building board material, of indeterminate length, showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image;

FIG. 3 is a top plan view thereof, the bottom plan view being identical; and,

FIG. 4 is a right side view thereof, the left side view being identical. 

The ornamental design for a building board material, as shown and described. 